Number | Name | Date | Kind |
---|---|---|---|
890770 | Hubbell | Jun 1908 | |
2976345 | Whitted | Mar 1961 | |
3582867 | Thompson et al. | Jun 1971 | |
3688635 | Fegen | Sep 1972 | |
3731261 | Spadoni, Jr. | May 1973 | |
4368942 | Mathe et al. | Jan 1983 | |
4691971 | Hahn | Sep 1987 | |
4969259 | Macek et al. | Nov 1990 | |
5122075 | Kile | Jun 1992 |
Number | Date | Country |
---|---|---|
33286 | Aug 1981 | EPX |
Entry |
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IBM Technical Disclosure Bulletin-Printed Circuit Board and Component Keying and Retention Design (vol. 33, No. 4, Sep. 1990) pp. 211-218. |